<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        #div1 div, #div2 div{ width:200px; height:200px; border:1px #000 solid; display:none;}
        .active{ background:red;}
    </style>
</head>
<body>
<div id="div1">
    <input class="active" type="button" value="1">
    <input type="button" value="2">
    <input type="button" value="3">
    <div style="display:block">11111</div>
    <div>22222</div>
    <div>33333</div>
</div>
</body>
<script src="js/index1.js"></script>

</html>